Docker容器内定时任务秘诀全解析

FROM ubuntu:20.04
# 安装 cron
RUN apt-get update && apt-get install -y cron

# 添加定时任务脚本
COPY script.sh /script.sh
RUN chmod +x /script.sh

# 添加 crontab 文件
COPY crontab /etc/cron.d/simple-cron

# 赋予 crontab 文件执行权限
RUN chmod 0644 /etc/cron.d/simple-cron

# 应用 crontab 文件更新
RUN crontab /etc/cron.d/simple-cron

# 创建日志文件
RUN touch /var/log/cron.log

# 设置容器启动命令
CMD cron && tail -f /var/log/cron.log

version: '3'
services:
  cronjob:
    image: your-image
    volumes:
      - ./script.sh:/script.sh
      - ./crontab:/etc/cron.d/simple-cron
    command: ["cron", "-f"]

# 每分钟执行一次 script.sh
* * * * * root /script.sh >> /var/log/cron.log 2>&1

#!/bin/bash
# 打印当前时间到日志文件
date >> /var/log/cron.log

FROM ubuntu:20.04
RUN apt-get update && apt-get install -y tzdata
ENV TZ=Asia/Shanghai
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

version: '3'
services:
  cronjob:
    image: your-image
    volumes:
      - ./script.sh:/script.sh
      - ./crontab:/etc/cron.d/simple-cron
      - ./cron-logs:/var/log
    command: ["cron", "-f"]

version: '3'
services:
  cronjob:
    image: your-image
    secrets:
      - cron-secret
    command: ["cron", "-f"]
secrets:
  cron-secret:
    file: ./cron-secret.txt

# 读取 Docker Secret
#!/bin/bash
SECRET=$(cat /run/secrets/cron-secret)
echo "Secret: $SECRET" >> /var/log/cron.log

FROM ubuntu:20.04
RUN apt-get update && apt-get install -y cron

# 设置环境变量
ENV SCRIPT_PATH=/script.sh

# 添加定时任务脚本
COPY script.sh /script.sh
RUN chmod +x /script.sh

# 添加 crontab 文件
COPY crontab /etc/cron.d/simple-cron

# 应用 crontab 文件更新
RUN crontab /etc/cron.d/simple-cron

# 创建日志文件
RUN touch /var/log/cron.log

CMD cron && tail -f /var/log/cron.log

# 使用环境变量
* * * * * root $SCRIPT_PATH >> /var/log/cron.log 2>&1

# 手动执行容器内的定时任务
docker exec -it container_name /script.sh

# 查看容器的日志
docker logs container_name

version: '3'
services:
  cronjob:
    image: your-image
    volumes:
      - ./script.sh:/script.sh
      - ./crontab:/etc/cron.d/simple-cron
    command: ["cron", "-f"]
    environment:
      - SCRIPT_PATH=/script.sh

version: '3'
services:
  cronjob:
    image: your-image
    volumes:
      - /etc/localtime:/etc/localtime:ro
      - /etc/timezone:/etc/timezone:ro
    command: ["cron", "-f"]

apiVersion: batch/v1
kind: CronJob
metadata:
  name: cronjob-example
spec:
  schedule: "*/1 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: cronjob-container
            image: your-image
            args:
            - /script.sh
            volumeMounts:
            - name: script-volume
              mountPath: /script.sh
          volumes:
          - name: script-volume
            configMap:
              name: script-config
          restartPolicy: OnFailure

apiVersion: v1
kind: ConfigMap
metadata:
  name: script-config
data:
  script.sh: |
    #!/bin/bash
    date >> /var/log/cron.log

# 监控容器事件
docker events --filter 'event=start' --filter 'event=stop'

# 查看容器资源使用情况
docker stats

# 发送邮件报警
MAILTO=admin@example.com
* * * * * root /script.sh >> /var/log/cron.log 2>&1

# 查看容器内的 cron 任务
docker exec container_name crontab -l

# 编辑容器内的 cron 任务
docker exec -it container_name crontab -e

# 删除容器内的 cron 任务
docker exec -it container_name crontab -r

#!/bin/bash
# 错误处理
set -e
date >> /var/log/cron.log
echo "Task completed" >> /var/log/cron.log

# 重启容器
docker restart container_name

# 重启容器
docker-compose restart service_name

# 停止容器
docker stop container_name

# 停止容器
docker-compose stop service_name

# 删除容器
docker rm container_name

# 删除容器
docker-compose rm service_name

# 构建镜像
docker build -t your-image .

# 构建镜像
docker-compose build

# 运行容器
docker run -d --name container_name your-image

# 运行容器
docker-compose up -d

# 查看容器状态
docker ps -a

# 查看容器状态
docker-compose ps

# 进入容器
docker exec -it container_name /bin/bash

# 进入容器
docker-compose exec service_name /bin/bash

# 查看容器日志
docker logs container_name

# 查看容器日志
docker-compose logs service_name